Stop my phone from restarting

We identified a problem in some versions of Windows Phone 8.1 that could cause a phone to restart periodically. We've already made a fix that has resolved this problem for the majority of Windows Phones. However, some phones that have not connected to Microsoft servers still need the fix to be applied.

First, check to see if you have an update available. Go to the App list, tap Settings

﻿> Phone update, and then tap Check for updates. If there is an update available, install the update.

To check and fix your phone using an app

Download the ﻿ Stop Restart app﻿ to your phone, open it, and then follow the steps in the app. (For best results, connect to Wi-Fi.)

The app will display either of two results:

Your phone is OK. Your phone is fixed, and you don't need to do anything else.

We need to fix your phone. Follow the "To fix your phone using a PC" steps in this topic if the app wasn't able to do so.